Slow weapon. Loading and aiming of the trebuchet each takes 2 Actions. It can attack targets behind cover through its arching attack.
Siege weapon. Moving the trebuchet ensures it needs to be aimed anew. It has Advantage against hitting constructions.
Targeted shot
Ranged Weapon Attack: +5 to hit, range 300/1200 (min 60 ft.), one target. Hit: 8d10 bludgeoning damage.
Debris shot
Within an area of at minimum 60 ft. and maximum 1000 ft., creatures must succeed a DC 13 DEX Save or take 4d10 bludgeoning damage.